H-D-Tyr-OBzl · p-tosylate

H-D-Tyr-OBzl · p-tosylate is a deuterated, O-benzyl-protected tyrosine derivative presented as a p-tosylate salt, featuring a chiral amino acid core with a phenolic side chain masked as an O-benzyl ether and a benzylic ester/ether motif that can be selectively manipulated under peptide-chemistry conditions. The D-configuration at the amino acid stereocenter supports stereochemically defined incorporation into peptidic or peptidomimetic sequences for chiral recognition studies, while the phenolic aromatic ring provides a handle for later functional group transformations after benzyl removal. The p-tosylate counterion increases practical handling and can influence solubility and crystallization behavior during protected amino acid synthesis and downstream coupling workflows. The compound's protected phenol and protected amino functionality profile make it suitable as a chiral amino acid intermediate for peptide building block preparation, chemical biology labeling strategies, and synthetic route design where controlled deprotection and side-chain activation are required.

1. Peptide Synthesis

H-D-Tyr-OBzl · p-tosylate serves in peptide synthesis workflows where a D-configured tyrosine residue is needed to probe stereochemical effects on folding, binding, or proteolytic stability. The amino acid backbone and the O-benzyl-protected phenol enable standard peptide coupling at the amino functionality while deferring side-chain reactivity until deprotection, supporting orthogonal protection strategies commonly used for tyrosine-containing sequences. The p-tosylate form can facilitate preparation of coupling-ready intermediates and can be compatible with activation and coupling chemistries that tolerate benzyl-protected phenolic groups. Downstream deprotection can regenerate the tyrosine phenol for subsequent derivatization, including conjugation or post-coupling functionalization, aligning with amino acid chemistry and peptide science requirements for controlled side-chain timing.

2. Peptidomimetics And SAR

H-D-Tyr-OBzl · p-tosylate is suitable for peptidomimetic construction and structure-activity relationship studies where incorporation of a D-tyrosine analog helps map stereochemical contributions to molecular recognition. The protected phenolic oxygen preserves the aromatic electronics during fragment assembly, while the D-stereocenter provides a defined chiral element that can be carried through synthesis into larger scaffolds. Benzyl protection supports controlled late-stage conversion of the phenol into reactive or conjugatable derivatives, enabling systematic SAR campaigns that compare side-chain modifications without perturbing coupling steps. The resulting D-tyrosine-containing intermediates can be used to generate libraries of analogs and to support medicinal chemistry-oriented scaffold diversification using amino acid-derived building blocks.

3. Chemical Biology Labeling

H-D-Tyr-OBzl · p-tosylate can be applied in chemical biology research for tyrosine-directed labeling and affinity probe synthesis where controlled phenolic deprotection is required. The O-benzyl-protected phenol functions as a protected handle during peptide or linker assembly, while the aromatic tyrosine side chain can be converted after deprotection into electrophilic or nucleophilic forms suitable for conjugation chemistry. The D-configuration can be leveraged to tune stability against enzymatic recognition, supporting the preparation of labeled peptides or conjugates used in biochemical assays and molecular interaction mapping. p-Tosylate salt formation supports practical intermediate handling during multi-step synthesis, enabling reliable downstream generation of functional tyrosine-containing conjugates from protected amino acid chemistry.

4. Protected Amino Acid Chemistry

H-D-Tyr-OBzl · p-tosylate fits protected amino acid synthesis and chiral building block development programs that require orthogonal control over the tyrosine side chain. The benzyl ether protection pattern allows selective deprotection to reveal the phenolic hydroxyl while maintaining the integrity of the amino acid framework for coupling or further derivatization. The p-tosylate counterion can be used to manage salt formation and handling characteristics in synthetic sequences that convert amino acid derivatives into activated coupling partners or downstream intermediates. Deuteration at the tyrosine residue supports isotope-aware studies and analytical traceability, enabling preparation of stereochemically defined, isotope-labeled peptide building blocks and intermediates for mechanistic investigations in amino acid and peptide chemistry.

5. Analytical Research Standards

H-D-Tyr-OBzl · p-tosylate is suitable for analytical research and method development where isotope labeling and defined stereochemistry support accurate quantitation and structural verification. The deuterated tyrosine motif can serve as an internal standard precursor when generating labeled peptides or fragments, while the protected phenol helps maintain consistent chemical behavior during sample preparation. The D-stereochemistry enables discrimination from L-tyrosine-derived species in chiral or stereospecific analytical workflows, supporting studies that require stereochemical resolution. Benzyl protection and the tosylate salt form contribute to reproducible intermediate handling, supporting downstream generation of analyte standards for LC-MS and related characterization of amino acid derivatives, peptide coupling products, and deprotection outcomes.

6. Pharmaceutical Intermediate Preparation

H-D-Tyr-OBzl · p-tosylate can be utilized in pharmaceutical intermediate preparation for peptide-based or peptide-adjacent chemistries where controlled tyrosine side-chain timing and stereochemistry are required. The amino acid derivative format supports incorporation into protected peptide building blocks, while the O-benzyl-protected phenol enables manufacturing-compatible protection strategies that prevent premature side reactions during chain assembly. The D-tyrosine stereocenter can be carried into final intermediates to support design of stable peptidomimetic structures used in industrial fine chemical synthesis. p-Tosylate salt formation can aid in process handling and intermediate isolation steps, enabling reliable conversion into downstream coupling-ready materials and functional derivatives that retain orthogonality for later deprotection and functional group transformation.

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